feldman



Sept. 10, 1929. FELDMAN 1,727,399

PASS TYPE ELEVATOR DOOR Filed Oct. 10, 1927 2 Sheets-Sheet 1 ATTORNEYSept. 10, 1929 H. FELDMAN PASS TYPE ELEVATOR DOOR Filed Oct. 10 1927 2Sheets-Sheet 2 w// I 7 v A.

. lvlllrllllalrllrl/lfltfi Willi/III INVENTOR I /K%ORNEY Patented Sept.10, 1929.

tJNlTEl) STATES PATENT OFFICE.

HARRY FELDMAN, OF BROOKLYN, NEW YORK, ASSIGNOR TO THE PEELE COMPANY, OFBROOKLYN, NEW YORK, A CORPORATION OF-NEW YORK.

PASS-TYPE ELEVATOR DOOR.

Application filed October 10, 1927.

My invention relates to pass type elevator doors, and more particularlyto the novel construction and arrangement of the guide rail structureand the parts co-operating therewith.

In elevator doors of the so-called pass type there are two generalconstructions, in both of which the door is composed of two sections,movable vertically toward and away from each other in a mannercorresponding to the ordinary counterbalanced elevator doors. It isessential, in pass type doors, that the arrangement of the parts be suchthat as one door in a shaft is opened, either or both panels thereof,usually both, will be brought to a plane parallel with the section of aclosed door at an adjacent door opening. Of the two constructions ofpass type doors herein referred to, and heretofore extensively used, onehas the upper sections of the different doors in a shaft mounted uponvertically extending guides arranged in the same vertical plane, thelower sections of such doors being each mounted upon guides all in thesame vertical plane which is parallel with the guides for the othersections of each door. The other type of bypass door is one in which asubstantially continuous rail structure is used and the section of eachdoor, during the opening and closing movement thereof, will havevertical movement with a horizontal component so as to bring eachsection in its entirety, in the same plane but parallel with the doorsat adjacent door openings.

My present invention has to do with a construction of door in which eachof the sections has only a vertical movement and in which one of thesections of each door, usually the upper section, is spaced inwardly ofthe shaft as compared with the lower section, so as to afford a pocketbetween the upper section and the wall of the shaft adapted to receivethe lower section of the door at an upper opening, so that with theopening of a door at a lower opening, the upper section thereof may passthe lower section of a door closing an upper door opening, and with theopening of a door at an upper door opening, its lower section may passbetween the upper section Serial No. 225,178.

of the door at a lower door opening and the wall of the shaft.

Heretofore, in this construction of door, it has been the commonpractice to provide guide rail structures employing a wall angle, theflange of which extending inwardly of the shaft had a depthapproximating the aggregate thickness of bothdoor sections and thenecessary clearances between these sections and between the lowersection and'the wall of a shaft, the guide shoes being upon the edge ofthe section as in ordinary counterbalanced elevator doors. This widewall angle not only involved a guide structure, the weight of which wassuch as to increase the difficulty and hazard of installing it in anelevator shaft, but involved the spacing of the sheaves over which theflexible connections between the door sections pass, a distance withinthe shaft sufiiciently great to necessitate extreme care in the mountingof the guide rails in order to ensure a proper support for the doorstructure from these sheaves; The doors of the general constructionherein referred to, possess considerable weight, ranging from fourhundred pounds upward per door, and the instability of the guide railstructure is, and always has been, a factor of great importance in suchinstallations.

ldurtherlnore, it was a common practice, in pass type doors as Well asin counterbalanced doors, to so construct the top bar of the lowersection that it engaged stops upon the guide rails when the uppersurface of this top bar was substantially flush with the floor of thebuilding, and thus afford what is known as a truckable sill, for thepurpose of relieving the connecting chains passing about the sheavesfrom loads passing from or to an elevator car, and transmitting suchstresses to the wall of the building through the guide rail structure.

\Vith the use of wide wall angles, the stops co-operatingwith thistrucking bar were of necessity carried by and projected from theinwardly projecting flange of the wall angle, so that the support forthe truck bar was so spaced from the wall of the shaft as to subject thewall angle to excessive stresses, particularly when heavy loads werepassing over said trucking sill. Furthermore, when such stops werepositioned a distance substantially equal to the thickness of a doorfrom the inner surface of a lower door section, it was nec essary toprovide a special construction of hanger bar so ofi'set as to projectbeyond and across the edge of the wall angle so as to be in engagingrelation with the stops, and with a reverse offset to bring the bar inproper relation to the sheave. It was also necessary to provide openingsin the wall angle, through which the sheave projected, in order topermit a proper running of the connections, although even with thisconstruction, there was a deflection, inwardly of the shaft, of thatportion of the chains running from the sheave to the lower portion ofthe upper door section.

WVith the above conditions in mind, the main object of my invention isto provide an elevator door of the pass type in which the wall angle hasan inwardly directed flange of a depth substantially equalling thethickness of a single door section, so as to not only re duce the weightand bulk of the guide rail structure and thus facilitate itsinstallation in an elevator shaft, but to bring the bearing point of allloads upon this rail structure sufficiently close to the wall of theshaft to minimize the effect of these loads upon the bolts or screwssecuring the wall angles to the wall of the shaft. ll ith the use of aguide structure embodying the invention, the sheave may be so supportedthat each of the door sections may be provided with means for securingthe chains thereto in a manner which will ensure a substantiallyvertical run of these chains upon opposite sides of the sheave,notwithstanding the offset relation of the two door sections one to theother.

ii rail structure in a door construction embodying the invention permitsthe utilization of an angle or 'T-bar, incorporated in, and forming apart of, the top bar structure of the lower door section, in a manner tosecure great strength and rigidity in this top bar structure and thefirm support thereof, and of the door section in its entirety therefrom,when the door is in a fully opened position. In this construction thesupport necessary to the truckable sill feature is close to the shaftside of the door section.

The invention consists primarily in a pass type elevator door embodyingtherein two sections movable in parallel vertical planes and in oppositedirections, guide rail struc tures adapted to be secured to the wall ofan elevator shaft, each including therein two guides both of which arecontained within a space of substantially the thickness of one of. saiddoor sections, means carried by one of said door sections closelyadjacent the wall of the shaft co-operating with one of said guides,means carried by the other door section and offset toward the wall ofthe shaft co-operating with the other guide, whereby said last nameosection substantially in its entirety, is positioned beyond said guiderail structure within the shaft, a sheave carried by said guide railstructure, and flexible connections passing over said sheave andconnected with said sections respectively; and in such other novelfeatures of construction and combinaion of parts as are h reinafter setforth and described, and more particularly pointed out in the claimshereto appended.

Referring to the drawings,

Fig. 1 is a condensed View, from the shaft side, of an elevator doorembodying the invention;

Fig. 2 is a condensed vertical section through said door upon a largerscale;

Fig. 3 is a horizontal section through one side of the door shown inFig. 2 while in the open position showing the lower section of one doorin cross section, and the upper section of a lower door while in theclosed position also in cross section; and

Fig. 4.- is a new similar to Fig. 3 showing the upper section of thedoor shown in Fig. 2 while in the open position in cross section, andthe lower section of the door above while in the closed position also incross section.

Like numerals refer to like parts througho the several views.

In the accompanying drawings the invention is illustrated in connectionwith a single door opening of an elevator shaft, the wall. of this shaftbeing shown at 10 and the metal buck about the opening therein, at 11.It will be understood that there a series of such openings in a shaft,one above the other, and that the construction herein described isduplicated at each door opening wl erein the conditions are such thatthe suace between the lintel of one door opening and the sill of theopening immediately above, is insul'licient to accommodate the doorsection which must move within this space during the opening movement ofeither the upper or lower door section. In new buildings there isordinarily uniformity as to all the door openings in the shaft, excepton the ground floor. in older buildings there is sometimes a variance insuch door openings, some of them permitting the use of ordinarycounterbalanced doors, and others requiring the use of pass type doors.It is to be noted that a pass type door may be used in conjunction withother pass type doors or with ordinary counterbalanced doors,

The door proper comprises an upper section 12 and a lower section 13,the details of construction of each of which, except as to the portionco-operating with the guide rail structure and the flexible connectionsbetween the door sections, are old and well known in the art, a metalsheathed wooden panel door section being il ustrated in the drawings.

While the guide rail structure extends substantially continuouslyadjacent all doors in a shaft, the invention can be more clearlyunderstood by considering that the door in each opening has its ownguide construction, which construct-ion laps the guide construction atan adjacent door opening, no part of the guide structures at adjacentopenings being common to a door section at each of these open ings.

It is the common practice to have the lower section 13 of a door closeto the wall of the shaft so as to avoid a gap between it and the sill,and to have the upper door section spaced within the shaft a distancegreater than the thickness of the lower door section, thus forming apocket between this section 12 and the wall of the shaft ofSllfllClQlli) capacity to accommodate the lower section 13" of a door atan opening above that closed by the sec tions 12 and 13, and to affordspace inwardly of the shaft throughout the same area of the section 13to accommodate the upper door section 12 of the door below.

This offsetting of the door sections has led to the use of a projectingastragal 14 carried by the upper door section, and the use of a movablelintel 15 which in the past has, in some instances, been n'iountedadjacent the lintel of the door opening and, in other instances, asshown in the drawings, on top of the door section 12. This construction,however, is old and well known in the art. 2

The offsetting of the section. 12 inwardly of the shaft in relation tothe section 13 when a truckable sill is used, necessitates theemployment of a top bar for the lower section 13 of a lengthsubstantiallytwice the thickness of a door section to avoid the presenceof a wide gap between the shaft and the platform of an elevator car,which extended sill has usually been secured by means of a T-angle 16secure- 1y bolted to the top angle of the frame of the lower doorsection, which angle 16 serves as a rigid support for a wide flange ofthe angle of the top bar proper of the door. This con struction forms ahighly effective truckable sill, and one of the purposes of the presentinvention is to more effectively utilize the strength of thisconstruction for supporting the lower section from the guide railstructure and transmitting the loads upon the sill to the walls of theshaft therethrough. The manner of accomplishing this will more fullyappear hereinafter, as it results from the particular construction ofthe guide rail structure and the co-operating guide means carried by therespective door sections.

The guide structure comprises what is known as a wall angle 12', made upof lengths thereof which, when secured in position in a shaft, extendsthroughout all portions of the shaft where the doors are to beinstalled.

Those portions of the wall angle 17 adjacent each door opening, when adoor buck is used,

have a deep flange 18 secured to the buck 11 by means of screw bolts. Ifdesired, this flange 18, instead of extending'toward the jamb of thedoor opening, may extend away from this amb, it being a common practice,where the wall angle has to be secured to the masonry of the wallinstead of to a metallic reinforcement thereof, to have the flange e2:-tend away from the jamb where it is more readily accessible for thepurpose of running bolts entirely through the wall of a building, orusing expansion bolts as a means of attachment of the angle to the wall.

In the accompanying drawings the use of a buck is illustrated, theflange 18 of the wall angle adjacent the buck bearing against same andbeing secured thereto, and a short wall angle or knee being used abovethe lunch as indicated at 19. The manner of securing the wall angle inplace, however, is immaterial to the invention, it being merelynecessary that the flange 20 of this angle shall be of a depthapproximating the width of the lower section 13 so that the footof theT-bar 16 may extend beyond the side edges of the door section and acrossthe inner edge of said flange 20 without bending the projecting end ofsaid T-bar 16. The wall angle 17 is common to all door openings in ashaft.

Secured thereto are rail angles 21 and 21, the former of which extendsfrom substantially midway of the height of one door opening, tosubstantially midway of the height of the door opening immediatelybelow, and the other of which extends from substantial- 1y midway of theheight of said door opening to substantially midway of the height of thedoor opening above. This guide rail 21 or 21 co-operates solely with thelower section 13 or 13 of a door, the guide rail 21 co-open ating withthe door section 13 at one floor, and the guide rail 21 co-operatingwith the, lower section 13 of the door immediately above. Each rail 21or 21 et seq., is so located upon the wall angle 17 as to be suffcientlyclose to the wall of the shaft to afford merely sufiioient clearance forthe free running of the door.

Carried upon one edge of the door section 13 are guide members 22, suchas ordinary guide shoes or other similar devices commonly used, whichco-operate with the guide rail section 21. The lower section 13 of thedoor immediately above the opening closed by the sections 12 and 13isprovided with like guiding means 22 co-operating with the guide 21.

It is customary, with vertically sliding doors, to so construct the doorsections that they will lap the door jamb to a certain extent, theamount of this lap varying in different localities. In the presentinvention, the sections 13-43 are each provided at the vertical edgesthereof with an angle bar known as a flame angle and indicated at 2323in the drawings. The guide shoes 22 and 22 are mounted upon this flameangle, suitable spacers 2d and 2% being used to properly locate theguide shoes 22 or 22 with relation to the guide rail. This, however, isa more detail of construction and forms no part of my present invention,being merely for the purpose of permitting the standardization of theguide shoes in both the upper and lower door sections.

The flame angles and the shoes carried thereby are upon one side of thevertical center of the door section carrying same, one flange of theflame angle being substantially flush with the side of the doorpresented towards the elevator shaft. This arrangement leaves a space ofsubstantially one-half the thickness of the door section 13, and permitsthe utilization of an inwardly directed flange 20 of a depth to becontained entirely within a space less than the thickness of said doorsection.

Each upper door section 12, 12 etc., is guided in its movements by meansof a rail angle 25 or 25 one flange 26 or 26 of which is secured to theflange 20 of the wall angle, and the other flange 27 or 27 of which e2;-tends parallel with the rail angle 21 or 21. This angle 25 is spacedfrom the wall of the shaft 10 a distance so as to be contained, in itsentirety, within a space of substantially the thickness of the doorsection 13.

The door sections 12 and 12 are each provided with a flame angle 28 or28" which pro jects from the section 12 or 12 toward the wall of theshaft to an extent to pass the plane of the door section 13 or 13 andpermit guiding means, such as guide shoes 29 or 29 carried thereby, toco-operate with the guide rail 25 or 25. A suitable spacer 30 or 30 isprovided to properly locate said guiding means 2929 with relation to theguide rail 25*25.

By the construction above described, the guide rail structure and theco-operating guiding means of both door sections of ach door, and of thecorresponding sections of adjacent doors, are all contained within aspace substantially that of the thickness of the door section which islocated adjacent the wall of the shaft, thus affording necessaryclearance for the projecting end of the hanger bar 16 beyond the guiderail structure within the shaft, and permitting the location of a sheave31 upon the guide rail structure in a manner which will permit theflexible connection 32, co-operating with said guide sheave and with thetwo door sections 12 and 13, to have a run substantially parallel withthe wall 10 of the shaft, since the wheel of the sheave will bepositioned upon the guide rail structure substantially vertically abovethe fitting 33 to which one end of the flexible connection 32 isconnected, and with a portion of the head of the T-bar 16 nected withthe chain 32, is connected. The narrow flange 20 and the guide rail 2525ensure the proper locating of the sheave and at the same time afford asupport therefor closely adjacent the wall 10 of the shaft.

Secured to the guide structure and project-7 ing inwardly of the shaftbeyond the end of the flange 27 and the guide angle 25 in a position tobe engaged by the foot of the T-bar 16 when the door section 12 is inits fully opened position, is the usual stop This stop is engaged by thefoot of the bar 16 which projects beyond the side of the door, one faceof this foot, that toward the wall 10 of the shaft, coming fairly closeto the flange 27 of the guide angle 25. In order to utilize as much ofthe strength of the T-bar 16 as is practicable and to afford thenecessary clearance for the projecting ends thereof to pass the gu Wrail structure, one side of the head of said T-bar is cut away beyondthe side edge of the door, thus leaving an angular portion of the l baronly. he remaining portion of the head is pierced, as shown more parrlvin Figs. 3 and l, to permit the pa ;r the turn buckle rod 3 1therethrough, 4 lispensing with the use of special litor a c evis atthis point.

The part marked 36 in the drawings is a fragmentary portion of a car ofan elevator door.

From the foregoing description it will be noted that the constructionand arrangement of parts is such to permit the utilization of a guiderail structure, the total projection of which, within the shaft, is nogreater than the rail structure of the ordinary counterbalanced door,and the truckable sill of the lower door section is not only as rigidthroughout as that of the truckable sill of a counterbalanced door, butis supported by the rail structure under exactly the same conditions asare present in the old type of counterbalanced door, a condition whichheretofore in pass type doors has not been attained.

By reference to 2 of the drawings it will be noted that with the openingof the door therein shown in full lines, the upper section 12 will havemovement in a plane parallel with the lower door section 13 of the doorimmediately above, and that the lower section will have downwardmovement in a plane corresponding with that occupied by said doorsection 13, and will pass between the section 12 of the door below andthe wall of the shaft, as shown in Fig. 3. The narrow guide railstructure affords clearance for the projecting ends of the T-bar 16within the plane of movement of the door section 12, as shown clearly inFig. l of the drawings.

It will also be noted that the sheave 31 is located in the plane ofmovement of the door section 12, but on one side of the door, and thatthe chain 32 hangs plumb. This sheave with which the turn buckle bar 34also conis only a few inches above the lintel of the door opening sothat in no case is there any interference by same to the movements ofthe T-bar 16. In fact these sheaves are located below the steps 35 onthe floor above so as to be protected by these stops.

The operation of the auxiliary or movable lintel does not differ fromthat in prior art pass type doors.

In the foregoing description, I have referred only to the constructionat one side of the elevator door openings and ofthe door sections, itbeing understood that this construction is duplicated as to the otherside 0 said opening and said sections.

It is desired to emphasize that with the construction herein described,the rail structure and all parts carried thereby, are within the planeof the inner surface of the door section 12, and that the space occupiedby both sections of the door within the wall 10 of the elevator shaft,is but little more than that required for counterbalanced doors of thetype using a T-bar as a part of the top bar structure of the lower doorsection in which one-half of the head projects beyond the surface of thedoor.

With the construction. herein shown and described, the various parts arestandardized in accord with ordinary counter-balanced doors, exceptingthe assembly of the guide rail structures, and the particularconstruction of theflame angle 28 or 28.

It will also be noted that no cutting of the wall angle is required toaccommodate the sheave 31 or bring it in a location which will ensure asubstantially vertical run of the connections 32 and 34.

It is not my intention to limit the invention to the precise details ofconstruction shown in the accompanying drawings. I be lieve it to bebroadly new to provide, in a pass type door structure, a guide railconstruction extending within the shaft a distance approximating thethickness of one doorsection only, which guide structure co-operateswith two door sections movable in parallel planes.

Having described the invention, what I claim as new and desire to haveprotected by LettersiPatent, is j H 1 1. A pass type elevator doorembodying therein two sections movable in parallel-vertical planesandinopposite directions, guide rail structures adapted to .be securedto the wall of, an elevator shaft, each including therein two guidesboth of which are contained within a space'of substantially thethickness of one of said door sections, means carried by one of saiddoor sections closely adjacent the wallof the shaft (to-operating withone of said guides, means carried, by the other door section and offsettoward the wall of the shaft co-operating with the other guide, wherebysaid last named section substantially in its entirety, is positionedbeyond said guide rail structure Within the shaft, a sheave carried bysaid guide rail structure, and flexible connections passing over saidsheave and connected with said sections respectively. V

2. A pass type elevator door embodying therein two sections movable inparallel vertical planes and in opposite directions, guide railstructures each embodying therein awall angle, the inwardly directedflange of which is of a depth substantially equalling the thick ness ofone of said sections, one guide extending parallel with the wall of ashaft from substantially midway of the height of one door opening tosubstantially midway of the height of an adjacent door opening, and asecond guide positioned inwardly of the wall of the shaft as comparedwith said other guide and extending from substantially midway of theheight of one door opening to substantially midway of the height of anadjacent door opening other than that adjacent which the other guideextends, shoes upon one section co-operating with said first namedguide, shoes upon the other section offset in relation thereto towardthe wall of a shaft into engaging relation with said second guide,whereby said last named section substantially in its entirety, ispositioned beyond the guide rail structure within the shaft, a sheavecarried by said guide rail structure, and flexible connections passingover said sheave and connected with said sections respectively.

3. A pass type elevator door embodying therein two sections movable inparallel Ver tical planes and in opposite directions, guide railstructures adapted to be secured to the wall of an elevator shaft, eachincluding therein two guides both of which are contained within a spaceof substantially the thickness of one of said door sections, meanscarried by one of said door sections closely adjacent the wall of theshaft co-operating with one of said guides, flame angles carried by theother door section projecting therefrom toward the wall of the shaft toan extent to pass the plane of said first named door section,means-carried by said flame angle cooperating with said rail structuresco-operating with the other guide, whereby said last named sectionsubstantially in its entirety, is positioned beyond said guide railstructure within the shaft, a sheave carried by said guide railstructure, and flexible connectionspassing oversaid sheave and connectedwith said sections respectively. 7

4. A pass type elevator door embodying therein two sections movable inparallel vertical planes and in opposite direct-ions, guide railstructures each embodying therein a wall 'angle,the inwardly directedflange of which is of a depth substantially equalling the thickness ofone of said sections, one guide extending parallel with the wall of ashaft from substantially midway of the height of one door opening tosubstantially midway of the height of an adjacent door opening, and asecond guide positioned inwardly of the wall of the shaft as comparedwith said other guide and extending from substantially midway of theheight of one door opening to substantially midway of the height of anadj acent door opening other than that adjacent which the other guideextends, shoes upon one section co-operating with said first namedguide, flame angles upon the opposite edges of the other of said doorsections projecting therefrom toward the wall of a shaft to an extent topass the plane of said first mentioned door section, shoes carriedthereby co-operating with said second guide, whereby said last namedsection substantially in its entirety, is positioned beyond the guiderail structure within the shaft, a sheave carried by said guide railstructure, and flexible connections passing over said sheave andconnected with said sections respectively.

5. A pass type elevator door embodying therein an upper and a lowersection movable in parallel. vertical planes in opposite directions, aguide rail structure extending within a shaft :1 distance substantiallyequalling the thickness of one of said sections, and including thereintwo guides, one of which extends from substantially midway of the heightof a door opening to substantially midway of the height of a dooropening below, and the other of which is positioned inwardly of theshaft in relation to said first named guide and extends fromsubstantially midway of the height of said door opening to substantiallymidway of the height of a door opening above, means carried by saidlower door section cooperating with said first named guide, meanscarried by the upper door section and offset toward the wall of theshaft co-operating with the other of said guides, whereby said lastnamed section substantially in its entirety, is positioned beyond saidguide rail structure within the shaft, a sheave carried by each guiderail structure, flexible connections passing over each sheave andconnected with said sections respectively, a T-bar forming a portion ofthe top bar structure of the lower door section, the foot thereofextending across and closely adjacent the inner face of said doorsection, one portion of the head projecting within the shaft, and theother portion thereof across the top of the panel of said section, andthe ends thereof projecting beyond the sides of the section. one side ofthe head beyond the section being cut away to permit the foot of theT-bar to come closely adjacent the inner edge of the guide railstructure, and stops upon said guide rail structures respectively in aposition to be engaged by the foot of said T-.bar when the lower sectionis in position with the upper surface of the top bar of the lowersection substantially flush with the sill of a door opening.

6. A pass type elevator door embodying therein an upper and a lowersection movable in parallel vertical planes in opposite directions, aguide rail structure extending within a shaft a distance substantiallyequalling the thickness of one of said sections, and including thereintwo guides, one of which extends from substantially midway of the heightof a door opening to substantially midway of the height of a dooropening below, and the other of which is positioned inwardly of theshaft in relation to said first named guide and extends fromsubstantially midway of the height of said door opening to substantiallymidway of the height of a door opening above, means carried by saidlower door section co-operating with said first named guide, meanscarried by the upper door section and offset toward the wall of theshaft co-operating with the other of said guides, whereby said lastnamed section substantially in. its entirety, is positioned beyond saidguide rail structure within the shaft, a T-bar forming a portion of thetop bar structure of the lower door section, the foot thereof extendingacross and closely adjacent the inner face of said door section, oneportion of the head projecting within the shaft, and the other portionthereof across the top of the panel of said section, and the endsthereof projecting beyond the sides of the section, one side of the headbeyond the section being cut away to permit the foot of the T-bar tocome closely adjacent the inner edge of the guide rail structure, stopsupon said guide rail structures respectively in a position to be engagedby the foot of said T-bar when the lower section is in position with theupper surface of the top bar of the lower section substantially flushwith the sill of a door opening, sheaves supported by the guide railstructures within the shaft above the projecting ends of said T-bar, afitting upon the upper door section, and a flexible connection passingover said sheave and extending in substantially vertical lines to thehead of said T-bar and said fitting with its opposite ends connectedrespectively with said T-bar and said fitting.

7. A pass type elevator door embodying therein two sections movable inparallel vertical planes and in opposite directions, guide railstructures each embodying therein a wall angle, the inwardly directedflange of which is of a depth substantially equalling the thickness ofone of said sections, one guide extending parallel with the wall of ashaft from substantially midway of the height of one door opening tosubstantially midway of the height of an adjacent door oneninsr, and asecond guide positioned inwardly of the wall of the shaft as comparedwith said other guide and extending from substantially midway of theheight of one door opening to substantially midway of the height of anadjacent door opening other than that adjacent which the other guideextends, shoes upon one section co-operating with said first namedguide, flame angles upon the opposite edges of the other of said doorsections projecting therefrom toward the wall of a shaft to an extent topass the plane of said first mentioned door section, shoes carriedthereby cooperating with said second guide, whereby said last namedsection substantially in its entirely, is positioned beyond the guiderail structure within the shaft, a T-bar forming a portion of the topbar structure of the lower door section, the foot thereof extendingacross and closely adjacent the inner face of said door section, oneportion of the head projecting within the shaft, and the other portionthereof across the top of the panel of said section, and the endsthereof projecting beyond the sides of the section, one side of the headbeyond the section being cut away to permit the foot of the T-bar tocome closely adjacent the inner edge of the guide rail structure, stopsupon said guide rail structures respectively in a position to be engagedby the foot of said T- bar when the lower section is in position withthe upper surface of the top bar of the lower section substantiallyflush with the si 1 of a door opening, sheaves supported by the guiderail structures Within the shaft above the projecting ends of saidT-bar, a fitting upon the upper door section, a flexible connectionpassing over said sheave and extending in sub stantially vertical linesto the head of said T-bar and said fitting with its opposite endsconnected respectively with said T-bar and said fitting, and a movablelintcl carried by and movable with the top of said upper section.

In witness whereof I have hereunto affixed my signature this 7th day ofOctober, 1927.

HARRY FELDMAN.

